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authorIngo Molnar <mingo@elte.hu>2009-05-24 09:02:37 +0200
committerIngo Molnar <mingo@elte.hu>2009-05-24 09:02:37 +0200
commita3862d3f814ce7dfca9eed56ac23d29db3aee8d5 (patch)
tree5cbc8c2cb9b11acb5bc21009d27da3978c1c0db2 /kernel/perf_counter.c
parentc2990a2a582d73562d4dcf2502c39892a19a691d (diff)
downloadop-kernel-dev-a3862d3f814ce7dfca9eed56ac23d29db3aee8d5.zip
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perf_counter: Increase mmap limit
In a default 'perf top' run the tool will create a counter for each online CPU. With enough CPUs this will eventually exhaust the default limit. So scale it up with the number of online CPUs. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: John Kacur <jkacur@redhat.com> Cc: Mike Galbraith <efault@gmx.de> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/perf_counter.c')
-rw-r--r--kernel/perf_counter.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index cb40625..6cdf824 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1704,6 +1704,12 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
user_extra = nr_pages + 1;
user_lock_limit = sysctl_perf_counter_mlock >> (PAGE_SHIFT - 10);
+
+ /*
+ * Increase the limit linearly with more CPUs:
+ */
+ user_lock_limit *= num_online_cpus();
+
user_locked = atomic_long_read(&user->locked_vm) + user_extra;
extra = 0;
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